AI-generated Key Takeaways
- 
          
The DropDownCustomFieldValue is a type of CustomFieldValue used for CustomFields with a data type of DROP_DOWN.
 - 
          
It inherits properties from BaseCustomFieldValue, including a required customFieldId.
 - 
          
DropDownCustomFieldValue has a specific field, customFieldOptionId, which links to a CustomFieldOption.
 - 
          
This field value is used across various Ad Manager services including CreativeService, ForecastService, LineItemService, OrderService, ProposalLineItemService, and ProposalService.
 
A CustomFieldValue for a CustomField that has a CustomField.dataType of CustomFieldDataType.DROP_DOWN
- Namespace
 - 
               
https://www.google.com/apis/ads/publisher/v202508 
                        Field | 
                  |
|---|---|
                        
                           BaseCustomFieldValue (inherited)
                      | 
                  |
                        
                           
                      | 
                     
                         
                            Id of the   | 
                  
                        
                           DropDownCustomFieldValue
                        
                      | 
                  |
                        
                           
                      | 
                     
                         
                            The ID of the CustomFieldOption for this value.  |